Of course we've already got these:
All the Music of the Bible
The Bible in Music: A Dictionary of Songs, Works, and More (an interesting concept, but not as good as I'd hoped for that price; I was expecting something as thorough as David Lyle Jeffrey's A Dictionary of Biblical Tradition in English Literature)
A Cappella Music: In the Public Worship of the Church (the other side of the theological argument taken up by the last of the books I listed above)
Bible & Music: Influences of the Old Testament on Western Music
I voted on this one, RP.
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